A Study About the Use of OWL 2 Semantics in RDF-Based Knowledge Graphs

Pierre-Henri Paris, Fayçal Hamdi, Samira Si-Said Cherfi

Abstract: RDF-based knowledge graphs have been attracting increasing attention since Google popularized the term in 2012. However, historically, knowledge graphs are based on Semantic Web technologies. Many years ago, several works pointed out the lack of semantics in some RDF graph. So the question is whether semantics is there somewhere. Hence, we conducted an up-to-date large-scale study of the current state of the Web of data regarding the OWL 2 semantics to confirm or deny older results. Moreover, we propose an ontology to capture which OWL 2 features are defined or used in a given RDF-based knowledge graph and the tools to instantiate such an ontology.